// ==UserScript==
 // @name         Copy to Scrapbox in Manga style
 // @namespace    http://tampermonkey.net/
 // @version      0.2
 // @description  Copy URLs of selected items from Gyazo to paste Scrapbox in Manga style
 // @author       motoso
 // @match        https://gyazo.com/captures
 // @match        https://gyazo.com/search*
 // @run-at       context-menu
 // @grant        GM_setClipboard
 // @icon         <$ICON$>
 // ==/UserScript==

(function () {
    'use strict';
    function makeNthPageSpread(arr, n) {
        let pages = [];
        while (0 < arr.length) {
            pages.push(arr.splice(0, n));
        }
        return pages;
    }
    const checkedCards = document.querySelectorAll(".card.checked");
    let urls = [];
    for (const card of Array.from(checkedCards)) {
        const span = card.lastElementChild;
        const url = card.querySelector(".view-operation").href;
        urls.push(url);
    }
    // 下の方が先頭ページなので逆順にしてページに分割
    const pages = makeNthPageSpread(urls.reverse(), 2);
    // 見開きに分割したら左とじに変換
    const rightBindingPages = pages.map(p => p.reverse())
    // 分割された配列を結合
    GM_setClipboard(rightBindingPages.map(i => i
        .map((i) => `[[${i}]]`).join('')) // 見開きを結合
        .join("\n")); // 見開きごとに改行
})();